{"id":625,"date":"2017-04-11T10:33:36","date_gmt":"2017-04-11T17:33:36","guid":{"rendered":"https:\/\/www.crystalfontz.com\/blog\/?p=625"},"modified":"2025-07-01T09:18:37","modified_gmt":"2025-07-01T16:18:37","slug":"what-is-an-alphanumeric-lcd","status":"publish","type":"post","link":"https:\/\/www.crystalfontz.com\/blog\/what-is-an-alphanumeric-lcd\/","title":{"rendered":"Understanding Passive STN Segment, Alphanumeric, and Graphic Displays"},"content":{"rendered":"\n<p><em>Learn about the three major types of Passive <a href=\"https:\/\/www.crystalfontz.com\/blog\/glossary\/stn\/\" target=\"_self\" title=\"STN stands for Super-Twisted Nematic. STN is the commonly used LCD material in passive character and graphic LCDs.\" class=\"encyclopedia\">STN<\/a> (Super Twisted Nematic) LCDs: segment, alphanumeric, and graphic.<\/em><\/p>\n\n\n\n<p>Passive STN (Super Twisted Nematic) displays come in three major types:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Segment<\/li>\n\n\n\n<li>Alphanumeric \/ Character<\/li>\n\n\n\n<li>Graphic<\/li>\n<\/ol>\n\n\n\n<p><em>Let&rsquo;s take a closer look at these 3 types of displays.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are Passive STN Segment, Alphanumeric, and Graphic Displays?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Segment LCDs<\/h3>\n\n\n\n<p>A segment display is the type of thing you see in gas pumps, calculators, or simple meters. It can usually show a few numeric digits and perhaps a few icons or symbols.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"250\" height=\"123\" src=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/scaleLCD-250x123.jpg\" alt=\"Segment display on a scale - crystalfontz.com\" class=\"wp-image-626\" srcset=\"https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/scaleLCD-250x123.jpg 250w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/scaleLCD-768x377.jpg 768w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/scaleLCD-700x344.jpg 700w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/scaleLCD-120x59.jpg 120w, https:\/\/www.crystalfontz.com\/blog\/wp-content\/uploads\/scaleLCD.jpg 800w\" sizes=\"auto, (max-width: 250px) 100vw, 250px\"><\/figure>\n\n\n\n<p>These displays are typically used where a very low cost is needed and fixed function display is acceptable. Unless you are making 10K units a month of a very simple, very low-cost device, a segment <a href=\"https:\/\/www.crystalfontz.com\/blog\/glossary\/lcd\/\" target=\"_blank\" rel=\"noreferrer noopener\">LCD<\/a> is probably not the answer.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Alphanumeric \/ Character LCDs<\/h3>\n\n\n\n<p>A character <a href=\"https:\/\/www.crystalfontz.com\/blog\/glossary\/lcd\/\" target=\"_self\" title=\"LCD stands for Liquid Crystal Display. An LCD is composed of two pieces of glass with a thin layer of liquid crystals between the glass layers. When a voltage is applied to the glass, the orientation of the crystals can be changed. This change in the crystal's orientation (called polarization) will make either a dark&hellip;\" class=\"encyclopedia\">LCD<\/a> can show a fixed set of numbers and letters in a simple 5&times;8 dot monospaced font.<\/p>\n\n\n\n<p>The font is stored in the LCD&rsquo;s controller (the <a href=\"https:\/\/www.crystalfontz.com\/blog\/glossary\/cgrom\/\" target=\"_self\" title=\"CGROM&nbsp;stands for Character Generator ROM. The CGROM stores the font that is displayed on a character LCD. When you tell a character LCD to display the letter 'A', it needs to know which dots to turn on so that we see an 'A'. This information is stored in the CGROM. By definition, (since it is&hellip;\" class=\"encyclopedia\">CGROM<\/a>), so when you want to display an &ldquo;A&rdquo;, you simply send over the ASCII code for &ldquo;A.&rdquo;<\/p>\n\n\n\n<p><a href=\"https:\/\/www.crystalfontz.com\/c\/character-lcd-displays\/21\">Alphanumeric \/ character LCDs<\/a> are typically a nice combination of low cost, good function, and ease of application.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><a href=\"https:\/\/www.crystalfontz.com\/c\/character-lcd-displays\/21\"><img decoding=\"async\" src=\"https:\/\/www.crystalfontz.com\/phpthumb\/phpThumb.php?src=\/images\/products\/CFAH2004ATMIJT\/CFAH2004ATMI_large.jpg&amp;h=350&amp;w=450&amp;far=R&amp;bg=FFFFFF\" alt=\"Crystalfontz 20x4 display\"><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Graphic LCDs<\/h3>\n\n\n\n<p>A graphic LCD has a regular array of dots, that can be turned on in any pattern to show any image, letters, numbers, or symbols. <a href=\"https:\/\/www.crystalfontz.com\/c\/graphic-lcds-&amp;-oleds\/17\">Graphic LCDs<\/a> offer the most flexibility, but take more computing power, since every single dot has to be managed.<\/p>\n\n\n\n<p>The current generation of embedded microcontrollers is quite powerful though, and most can easily handle the extra load of a graphic LCD.<\/p>\n\n\n\n<p>A graphic LCD is the best solution to assure that you have future flexibility in your user interface design.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><a href=\"https:\/\/www.crystalfontz.com\/c\/graphic-lcds-&amp;-oleds\/17\"><img decoding=\"async\" src=\"https:\/\/www.crystalfontz.com\/phpthumb\/phpThumb.php?src=\/images\/products\/CFAO12864D3TFH\/CFAO12864D3-TFH-PoweredOn.jpg&amp;h=350&amp;w=450&amp;far=R&amp;bg=FFFFFF\" alt=\"\"><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Questions about These Types of LCDs?<\/h3>\n\n\n\n<p>If you have any questions about these types of displays or would like help choosing the type of display module would work best for your project, please&nbsp;<a href=\"https:\/\/www.crystalfontz.com\/contact.php\">contact our knowledgeable and friendly support staff<\/a> by email, phone, or chat.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn about the three major types of Passive STN (Super Twisted Nematic) LCDs: segment, alphanumeric, and graphic. Passive STN (Super Twisted Nematic) displays come in three major types: Let&#8217;s take a closer look at these 3 types of displays. What are Passive STN Segment, Alphanumeric, and Graphic Displays? Segment LCDs A segment display is the [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":627,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[4],"tags":[],"class_list":["post-625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-frequently-asked-questions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understanding Passive STN Segment, Alphanumeric, and Graphic Displays<\/title>\n<meta name=\"description\" content=\"Passive STN LCDs come in three major types: Segment, Alphanumeric \/ Character, and Graphic. 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